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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef6d99c9b9b921abdb9b8547c02215092a354fca9d2a4c239f6c3d53b43d73c' 
  AND token = 'GGnbiOftHbxT5Qvkzc4XtyBn9bc0fEfnGVgChnwogTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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