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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '255d937cc5431058986066ccec93fc823e56ff5fbbc083a1d3b2396a0e924739' 
  AND token = 'GoLOYs3RncYQXkW866K12nk8XZLmAkzEwDWS8Q03Feo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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