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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ebbc647f085e76a4ce08e9b9f6aa7129b12be4a2f3c75140771200ea65ee61' 
  AND token = '8fMyT1nYtl3dPH4F9Rekzv8vLKPRoaPyqujsVY72r1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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