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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f03b65142456c5d94a55e8e63f2afb3c460c2eedbba0545cc74f056f9b8b0ae9' 
  AND token = 'eTmwrdZ6BDJoBRQ5Kff6hOelbs5tl1nD/q+nA3eSUjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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