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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7dae1252922318589204c885f5a3d03c4f36795330f2e13eee0006c44c1f672' 
  AND token = 'Pw24fLzpztrXqCu5rOMBW2nbuB6LpIhU4Os9SYEN2pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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