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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9790d70eb886c7e0e9c198797925ceb20fced469df1808ad402348dd97f64a9' 
  AND token = 'FpRbulV2eDfZu5pPaeb3Xlnah9dmthBUNeedsL+9ZjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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