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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f502a29bf1778b87608b49bde66f82aaf1c3e1c4f91aa29e6c5fa1646f9b52e' 
  AND token = 'HskXjbxi/arvtnVYjC35yeg/D9K15Ga1CpBoQYcU8s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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