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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb75ebd01b25687bfe9807c78e62d3bdf05dd16f3430a4604d926ca1cdba3ff9' 
  AND token = 'jcA1Tmj2hT3sNqVeMaqkLlJnVeTasuavzxU9HPR/0XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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