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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48e1d44968b08e5e24c37ba8f8ddd5b3596283941d4574657ac1a723c1e1a87c' 
  AND token = 'dKfMeOmcR2O/MxqhV8iDEI+Ka757qLgD8ndXT6M//Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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