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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68af7ccd98197ebb62631141efd3920e1050c3a1db6c767139a17e3e11367faf' 
  AND token = '/nVAGiQdGzyIUvF+vv3MjML1YZxsfaArqwFCHw++41U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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