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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38791d63925a18f196a988b4f286d889d8d164391eaa6e53bb5f50ffe1dcaaf7' 
  AND token = '+PSAeUlJ4UHut6DI2gvp76RnpbJpUBG79wEoFL8k0u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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