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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e371364a9a3a22c4de3293790b162bf745a4fe96be37cada2412f3475af7178' 
  AND token = 'pJGc0wPWy+tI6pq77ESGfos3c6OH5Y+8p9sUz2x8HrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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