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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce7cd4156cb581b3870662ccab5a678cf3d9619c6fe1bb485b35008adcaed62' 
  AND token = 'u86Dct4X685V/pHLeuGNR9t/9lRTb4EidG/s3Yp6uWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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