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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a58952dfa63a518e4a266ab398668fcd6cfdb27aeb1152e8db9d155b62dd458' 
  AND token = 'd/yiXTTwlqh9JdwBs0pYEU3pX5IVRDsWcVS6InZypws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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