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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec559dd5511eca91dd341510c9230180691e675d56dde036614d852fc2b71f2b' 
  AND token = 'faAEeLuRdF+OiqckGQApNQkyjk5Mn7NT/aG1cKRjckg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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