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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e6c143b4b8f008e369ed1ec95b8f5f3fd42f52640b2e9b7f469b8e6ffe23cc2' 
  AND token = 'DNphYkl954cFInpWVUNi41QgwyF+zKnrivbS3QCxr2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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