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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '353cf12b27b5530f1b82dca5eb6eab75109b05fe8399b60d952fc0e3a81afbd4' 
  AND token = 'gplAFoh5I8pnZ9r9lRQ5EGvsamishkNBhbfaZbmdEnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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