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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055db5a1f41ae2d8447f3dd1218622162acf35a0db01af350460cdb5a45852e5' 
  AND token = 'f1lrVu2LqoZR+BjH22cWkV7+Dyx9PO8wPelGvtPtKkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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