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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f49e0891e21173795a10098e3d6ddaf75962e8efd23aabb092c0d77a3a3b7d6b' 
  AND token = 'mB8KRZRmmWHmnewNTAhPUnZ8mNhktH7Nj8IyRovOV84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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