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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7afa6d71ea3d71275618ed59c43077e473b4b208b55b84936ed84de934f0f373' 
  AND token = 'ZC9R/j3a7O1BgzzMee+x084LOdJIeQOhii8LXC6o23c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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