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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1203eea1382d3d39874ccc7cf674a2e508b1952c9a90ef5bb50fb192ee2cd8' 
  AND token = 'Bfq62dg3yPjPi0k4VCFkKnFz2mGQ56WEAY5O/wofaOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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