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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e753e594797d2c3812eeb55437f1c38c7363b20813ad5eaadc216ef4dd0a28b3' 
  AND token = 'Kgjh5M3qlxWI/i8tr5gCBBg2e7S/3clxZatgjw+Q/LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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