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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0504a2c1db76a592b6b2ab69fd7f36645749c31e2e79bf42ab24d132cbd4d9a4' 
  AND token = 'Wm6d0qmpq0p12a9G4BPW1hlC9u3XTqIv08997bMIH40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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