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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b96d6137dd4a9596d4caf618106ffc3df2b6e0c37510fbf6cf9ac430bc2c215' 
  AND token = '/RCQ9YaKXi2fuRjZmuhLPlNCj9FWjqH09jkkBmlxFdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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