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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98376781c1c50098a53da3ac52c9e6de843d40b43984244476b0363e95f96d28' 
  AND token = 'nQxai4sQtycBV5u1jJ+GwtxFNgOwpIBOz1GWlmEPBu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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