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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c1252799e203281e8c2e6ea20be5c9b1c58d26a9a8a95bfdedc3312037b76e' 
  AND token = '7LxiDiGXPFp0h9sjXuSfnYYsclCxyB9ntGNOlKsJROE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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