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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9244300490a00f195dc4756b7463c82bbe7cec3e9f797f2306d6489d4058004b' 
  AND token = 'QPsUvw+WmMGHap8K06wqzodKfe0K0M2Wss1+GGrJEJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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