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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48e11a10f6a52987182354b1d5e8e60b5af1f61ad84c68a223a8a456ab2615bb' 
  AND token = 'n3610sOQbb2Ua+qrkuPw3KhALnAydX8m3WwIC1NxHBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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