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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '207f771c324e96507ca7920411aab25e7830191e7f5f3ab2bad7baf5ec204559' 
  AND token = '8B+qsQ9XilCuYndftI8Kmkg3C89+zAHer0ua/4EfeTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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