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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f63d13e1bf6b0fdf904d3f30dd8cd6358d718526f7b44a04b5fc6f2b81c321d2' 
  AND token = '/yjtU34SG/H6RwfG6FpREjtN1eOsImSXkhZAWhHthlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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