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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1778151ff16cb3a7c2ed2eae314dee699a871354d5d411a516e4725b1f828f7' 
  AND token = '86sIXWxCF/DPXrViUhGtojsGg4F1oPF99h4+bDAzfjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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