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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72eec9c0a5d924e411a0280ebc3f728c15c95996155d4b1e284aef2e647f76fb' 
  AND token = 'PaLcabnIfnotoqQKAGsUVgjhDvZnMWREKuJh5vb5cDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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