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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92170e1b7116e30e3bcea93fad5df9b28d8f8d4051c70c5f2d405d49bb239e7a' 
  AND token = '8PppzzgZV3nNYywRI9CRD8cFz29jg4Hyw17OO3kHWTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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