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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '025c1ce029714b1320eb2ba9428db88f87ca4dea4eb413460f5e0d55f78d9924' 
  AND token = 'YdnAFJOzyAzbPwAp30306wR6a5v4/5B0d7tnCQdkpzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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