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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc330558724051fac1183053747d3907f51d00ee713991d9b8abaf86eb7a1a68' 
  AND token = 'ALTa7SWUSyJueWmVCHCImZVsrTk+Njd1K0lve3PjjDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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