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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b963a0e372d8adbe7014e295f7cf3d04132433a8e8bc33cd7f29cb7860b098fc' 
  AND token = 't7cnVldbUMjPrWUxNS0AB6mtrNbKK1I9aZrJJc1AluI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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