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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89426cce58d5b36c1be6ba2c7d9c93fa5c1d43d40806c10403790e14a1cb72e2' 
  AND token = 'hGcfoJhtM08QbUeTSI3k+G8GsgNMKEQevscSEqrNwT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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