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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a06d869d0fc004dd8c17434721a9e252301f9efb39b62f048ed849c6761ded1' 
  AND token = '/zzf34xHjv59dNk/hCCwsJuxDgdx6M1/xGLGfNFfWdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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