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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3b2021b79104e86d86bb24fa567173ae0735fe85000b13691364c071f606ab' 
  AND token = 'zJdFu698EIwvkcz12cOaQ/AdYxUR/9KMs6TLuzQeduk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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