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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a0b5d9ee93721d867844ac596a53b001c9ded8c3380007037e07e5982964e7' 
  AND token = '3rxGE9ewn47T2q6Gba4Xta1KvqsqlPlGSXGDQLYS6cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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