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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08e337daf28d59a1dc3ca2c342ae71eb1655f8cb501d0b5f9a8c52b65f3e205' 
  AND token = 'Rf7eJgzB/ODXEzz8H8ZmnuMdJrS/DD0FUP4JCRJPSgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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