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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c13cae73cc16e615feb8bca11fed290b7ff5120d4f0a063454d053e8042142' 
  AND token = 's9NNYfjW+VG1qNHZEiqPMkira7Mjyd90QMMngOPrZYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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