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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce50ab63b84de7e07334152f9d9a4bc4faef15ea14f088119147d5068302e598' 
  AND token = 'kS7RFTWl5UtSJjUm+qoEt8rNiunO0kpksu+s23+4+ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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