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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01576871274dfa70a8ebe2f8812492b998b29d1aa6a2dc267020524511849311' 
  AND token = 'u1VTnrsfzaenr+qZ1Lew1caXOjri4bkeM4+z6MO85Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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