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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c1a871b2ed30123d195a44e4f0a37044a6aab1d7c2770fa4f098a13c8542ae' 
  AND token = 'BWTmp2uooszfzlO34NB/BHo6tGZDk1NFxGxmwgHPb3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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