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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fba4a081bcb54a74348513fb3b907ab59ca677a3a59a64a9c4d770c490ae121' 
  AND token = 'H30+NvbVPFMVBozcLM+duRgPqhDq878Uw1/t9+Y5fqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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