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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266e8a4a9443e4282149012d58383c85f5cbe4833c0094f841dfbb241c25cdb3' 
  AND token = '6Nuud7NYLhPb6FWpK61WI6CuNxT8IMn2N1m8ljnPAEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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