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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4de89419ad764f1361ccdd8af17640e01df839ec4d8e84383cafe9bcd66fbb' 
  AND token = '/IDCRz4rsvVGYdqCTpq2hYmvI6drbYXcZ8WaCP3AlMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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