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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0009363b827378a237d115d937c153350943fd5ba118dd69ea9b48ce3cd10380' 
  AND token = 'e7tT/RXNJIUecby0WpOWe+MH+grxeKz8ziryhJac3sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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