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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46ecf86089cae5fe528af22a16586cc6ddb0767c21b13a481f50bbba4d40591f' 
  AND token = 'gZ1Ck14VeRAyvpjf/qsbwZbaJu4JLg0yIhSSe2TDZuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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