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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a907032366c5cb07e74e56ed78d9adca64ad49711338b31d75120678b9500986' 
  AND token = 'jSq5sJE9xKfXlICOfqMBV6tXxvUxb4tIfrHyeYidMMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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