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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf922a1cb359e18e8fbf0370b82b34a8bc0a4681dad4e19206db8474f8eb388' 
  AND token = 'LB4Nw91f04pb//JfPCt7GId9DtES8EH7iBypN0KkKgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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