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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52a2bdb156a53c1b74fd297d9089bbb95d598a16dee26060b3a8cf251d75b00b' 
  AND token = 'ABoRF26W3LgXPlkgzs8WLFRijv0vjaH/pNj1vaIXOHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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