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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07101ef0c7f685721ea0d28e12fde50790f66280a6f9c5fc56d61ee2de78554c' 
  AND token = 't5S74hyJ4LkreiCt+ojyGUCemkFAJRzz5zKCG55h0gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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