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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c3ea660758733ab657398ffab42148253d847319e9e05de3569db0d93d6870' 
  AND token = '1hSyxiXRHwbfiZ1ZZTb6SAUpEcVGQ9am5cY3O/jYaI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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