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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b59954d2da8ce230d4a7273f75fea81e89568cb287c7b0e2a2ba6f5dc769a718' 
  AND token = 'v/W32k50a1HThk6w2/S3YyLRXENCkEV0YnE9gr4Ux6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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