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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e59d56e3904d6500885526ab51e4ab103b90fc10ba9d67dcba16b46fbf61c2d' 
  AND token = 'ysSqRJPgicf09UH02K5ssO58gahmEo9/efiHMF3EW6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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