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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8772f921c9bd8fac9c2aa50532baf50de73b3cc4065ca7660220a354cca759c3' 
  AND token = '1yYaIseqYdoSKJ0xIXrTeTtlP4G4rwl3F+XSTl2l5YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}