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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aae3ba73336110d0bad340b62299970e3bf93d3b3c4bc121af01183c04e526f' 
  AND token = 'Yvez3+yfK2N1ym4nr1MD5rCxdxnVBTDGizwhaEM4tcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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