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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26bd28e96392792b36c6ad75b59145c108010da6139e217b81ee409481c05282' 
  AND token = 'zF1p5wfwCptlW4lveisXqOTKD5r7rvGRv2e59HC6jfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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