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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d140b01f7e281e5613fd47a3a9f53aa367d8a60b4586c874553935d759db40' 
  AND token = 'l17Hy87ST6NjcjArm8cZ57QnFk6xcHHncuDLdcaZ5kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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