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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31971c742d5ee7401363a94756e0db51830e666909e5f5a57700ed66a9b818a9' 
  AND token = 'p+L6mQ993nn6mUEPXdSS6bXx8RrU2TokMcJLVmEvfSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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