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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77bbb1d64d772dbeb16a5705e663c7d071eaca227e6acc5cc544357bf4cea566' 
  AND token = 'cDf18QNNSzEiAQYunCNWloNjip00hGhSXkiR8yV+q6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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