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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3ddd362211744f941975aaff0ab337a4fcfada9e6120e58ecd7ef42d68bb13' 
  AND token = '8g5dfxqIwMB9haGBBrbikvz+UBOy3RO9FMJp18GoeKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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