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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee19cb4a1b53c9767d7e62bcaaeae5c9934b35ff9984d71d49ec58df28fc7a54' 
  AND token = '6r+xR5nj1pdivMCSy3xMYn03vp+ONkZW0WYazi1UDLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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