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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e8ecd3feec5cd02a2263c6e8ef98b7c55cbb5497f781bc3d135900eda078f9' 
  AND token = '0bD7N0VoHh2xU+Uj+dPGODQNo2ljc3w41ojPuVmSf0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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