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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af69cee2b87b7100237b21122bd8cde50d3074941eaaef96cc986dd0a321ad4e' 
  AND token = 'UecJvy3p6Zlg0cRH7Rt7067gI+GAquWhFTWqqJHh9Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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