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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75909f33ad85acf5b9333f56e3ae173d976f0e4c355d2bbaf90a4c28f6429587' 
  AND token = 'u1v5hAAkLzUzJLx9ne919RxhxU6FWY6jAbJPKi50Q4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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