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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76efeb0e89a23c5a33f6202c467278f1a7a33400eb8967286001528cd9cf831' 
  AND token = 'SyCY0VebSsoR43YTy/dBMpB0nW38Ri1GrPNWg/G4coA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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