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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7284368d571536515769bd297feb42ae21ed157fbd9c2e4b39563079daa0e6' 
  AND token = '6N+wlxyYOK2C8Xg2KgbrHKm7ZDYl+eDO6eJQFlQ3n9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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