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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fdd2d17f14dfba03c69bb3909cee96ea329c078c6a464e0221a64079417864e' 
  AND token = 'ElMxPgGRWfjgIwhLHJMeZqdqgmzf+PfZegkyfL/8qdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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